The double Penning trap mass spectrometer JYFLTRAP has been employed to measure masses and excitation energies for $11/2^{-}$ isomers in ${}^{121}$Cd, ${}^{123}$Cd, ${}^{125}$Cd, and ${}^{133}$Te, for $1/2^{-}$ isomers in ${}^{129}$In and ${}^{131}$In, and for $7^{-}$ isomers in ${}^{130}$Sn and ${}^{134}$Sb. These first direct mass measurements of the Cd and In isomers reveal deviations to the excitation energies based on results from $\beta$-decay experiments and yield new information on neutron- and proton-hole states close to ${}^{132}$Sn. A new excitation energy of $144\left(4\right)$ keV has been determined for ${}^{123}$Cd${}^m$. A good agreement with the precisely known excitation energies of ${}^{121}$Cd${}^m$, ${}^{130}$Sn${}^m$, and ${}^{134}$Sb${}^m$ has been found.

• Received 26 June 2012

DOI:https://doi.org/10.1103/PhysRevC.87.024307